[patch] gdb/testsuite: Adjust command completion output when TUI is disabled

[Sandra Loosemore <sandra@codesourcery.com>]

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This is another almost-obvious testsuite fix, for one of the 
command-completion tests that was failing due to an incorrect assumption 
that TUI commands are always present.  OK to commit, or is this just a 
poorly-designed testcase that we should rewrite some other way instead?

-Sandra

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commit 8e0cc2870a30390e745110d4c8181f010d09c17f
Author: Sandra Loosemore <sandra@codesourcery.com>
Date:   Mon Jun 22 23:01:19 2020 -0700

    Adjust command completion output when TUI is disabled
    
    The history-scrolling commands "+", "-", "<" and ">" are only known to
    GDB when TUI is enabled.  This means the "complete pipe " command
    produces different output depending on whether TUI is present, which
    in turn caused
    
    FAIL: gdb.base/shell.exp: cmd complete "pipe "
    
    This patch provides different patterns for that test depending on
    whether or not TUI is available.
    
    2020-06-23  Sandra Loosemore  <sandra@codesourcery.com>
    
    	gdb/testsuite/
    	* lib/completion-support.exp (test_gdb_completion_offers_commands):
    	Adjust for omitted commands when TUI is disabled.

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index d6c43e6..38f2188 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-06-23  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* lib/completion-support.exp (test_gdb_completion_offers_commands):
+	Adjust for omitted commands when TUI is disabled.
+
 2020-06-22  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
 
 	* gdb.base/default-args.exp: New test.
diff --git a/gdb/testsuite/lib/completion-support.exp b/gdb/testsuite/lib/completion-support.exp
index 18eac82..51436cc 100644
--- a/gdb/testsuite/lib/completion-support.exp
+++ b/gdb/testsuite/lib/completion-support.exp
@@ -555,10 +555,19 @@ proc test_gdb_completion_offers_commands {input_line} {
     # Force showing two commands.
     gdb_test_no_output "set max-completions 2" ""
 
-    test_gdb_complete_multiple $input_line "" "" {
-	"!"
-	"+"
-    } "" "" 1
+    # TUI adds additional commands to the possible completions, so we
+    # need different patterns depending on whether or not it is enabled.
+    if { [skip_tui_tests] } {
+	test_gdb_complete_multiple $input_line "" "" {
+	    "!"
+	    "actions"
+	} "" "" 1
+    } else {
+	test_gdb_complete_multiple $input_line "" "" {
+	    "!"
+	    "+"
+	} "" "" 1
+    }
 
     # Restore.
     gdb_test_no_output "set max-completions $max_completions" ""